Brake



Aug. 24, 1937. A. Y. DODGE ETAL BRAKE Original Filed March 29, 1924 2 Sheets-Sheet 1 A. Y. DODGE ET AL BRAKE Original Filed March 29, 1924 2 Sheets-Sheet 2 jrwerwm;

Reissued Aug. 24, 1937 UNITED STATES PATENT OFFICE L. Pollard, Chicago,

11]., assignors to Bendix Brake Company, Chicano, 11]., a Wration of Illinois Orlrlnal No. 1,818,199. dated August 11, 1931,

Serial No. 702,785. March :9, 1m. Application for reissue July 17. 1935. Serial No. 31,952

17 Claims. (CL 188-152) Our invention relates to brakes. One oi the objects of our invention is to provide an internal brake construction which will combine the advantages oi the band brake and the 5 shoe brake. A further object of our invention is to provide a brake which will be simple in construction and effective in use. Further objects will appear from the description and claims.

In the drawings in which several embodiments lo 01 our invention are shown:

Flzurei isasideviewoi'aninternal brake construetion; Fig. 2 is a side view showing a diiierent iorm ot brakeiand Fig.3 is a side view of still m operate.- a minor: diametrically opposite brake w-shoes ll and=ll.pecured to the-brake band ll.

provided with a turn-buckle II (or adiustment. 45 In order to release the brake when the pressure is released in the hydrauiie actuator. springs it sprins II actinlto raise the bottom oi the brake band away irom the brake drum.

13 with the lockarrn I.

The link It iscurvedsoastoclearthestubaxle on which the wheel is mounted.

It will be seen that this brake'is equally eifective no matter in which direction the brake drum is rotated, and that it will he sell-energizing is practically thmua'hout the entire circumierence oi the brake hand.

The construction shown in Fla. 2 is substantially the same as that just described except that here the brake band is made in two parts, 2! and 10 ll. each extending substantially 180 degrees. In this IOXIIILCWO abutments, Iisnd 8!, are provided. at diametrically opposite points, for holding. the ends 88, It. It. and it of the brake bands mounted in a suitable it and Il'an providedior'releasinjthe'hrake'hands mum mm." m nimum)- tion # the es eem 2". e

In thisior n thcllnksiland-Jlsnay he'actasted by means m moir-gm shill and 'soctetconneetionat l t with the links it and "."and having-a hall and at The ma is and u are secured to band II and located on opposite sides 0! the abutmeat It. 'A sprint I! is provided'ior the brake band when the hydraulic pressure is Inalloithe iormsshowmthelinklliscurved to provide clearance tor the axle II. Also in all 45 of the tonnniidulred. a cushion ll niaybe provided between the shoe and the brains hand to cause the brake shoe or segments to hear evenly onthchrake band.

Having thus described our invention, what we 60 claim as new and desire to secure by Letters Patent of the United States is:

1. An internal brake construction comprising a brake drum, flexible brake band means bearin 5 on the inner surface of said brake drum. abutment means for holding said brake band means against movement under the action of the brake drum, and means for exerting radial pressure on diametrically opposite portions of said brake in band means including a toggle linkage pivoted to opposite sides of the band.

2. An internal brake construction comprising a brake drum, flexible brake band means bearin on the inner surface of said brake drum, abutment means for holding said brake band means against movement under the action of the brake drum. and means for expanding said brake band means comprising a fluid pressure actuator mounted on one part of said brake band means and acting on a plurality or other parts of said brake band means movable independently of said one part.

3. An internal brake construction comprising a brake drum. brake band means bearing on the 5 inner surface of said brake drum. means for holding said brake band means against movement under the action of the brake drum. and means for expanding said brake band means comprising a fluid pressure actuator mounted on one part of said brake band means. and a pair of links actuated by said actuator plvotally connected together and pivots-11y connected to other arts of said brake band means movable independently of said one part.

4. An internal brake construction comprising a brake drum. flexible brake band means bearing on the inner surface of said brake drum. abutment means for holding said brake band means against movommt under the action of the brake to drum. and means for expanding said brake band means comprising a fluid pressure actuator mounted on said brake bondmeans. and apair of links actuated by said actuator plvotaliy con nected together and pivotally oonnected.to said brake band means at diametrically opposite points.

5. Aninlernaibnkeconstruotioncomprlsinga brake drum. flexible brake band means bearing on the inner surface of said brake drum. abutsoment means for-holding said brake band means against movement under-the action of the brake drmnnarcusteshoebearlngonsoidbrake bandmeanasndacushionpadbetweensald arcuate shoe and said brake band means to cause ssthearcusteshoetobearevenlyonthebrake band. g

6. Abrake'compdsingJnoombinstlcmadrum. an expansiblc friction device within the drum. n fluid pressure actuator mounted on the central soport of the iriction device. and means operated by the actuator and engaging a plurality of spaced parts of said'device spaced from and movable independently of 'said central part to expand it.

as 'i. A brake comprising. in combination. a drum. an expanslble friction device within the drum. an actuating device mounted on one part of the friction device. and a linkage operated thereby and acting on a plin'siity of separated other parts of the friction device. the pressure on the linkage and the reaction on the actuating device expanding the lriction device at a plurality of separated points.

8. A brake comprising in combination a drum.

5 a backing plate, an anchor on said backing plate.

a friction device within the drum anchoring at one end of the friction device, directly on said anchor when the drum is turning in one direction and at the other end directly on said anchor when the drum is turning in the other direction. and fluid-power expanding means carried by and acting on said friction device.

9. A brake comprising, in combination. a drum, a backing plate, an anchor on said backing plate. a friction device within the drum anchoring at one end directly on said anchor when the drum is turning in one direction and at the other end directly on said anchor when the drum is turning in the other direction, and fluid-power expanding means acting on said friction device and shifting to permit said device to so anchor.

10. A brake having friction means and operating connections therefor comprising. in combination, toggle links acting on two parts of the friction means. a pivot connecting said links. and an operating device connected to said pivot and acting through the pivot and links on said parts of the friction means and also acting directly on a. third and independently-movable part of the friction means.

11. A brake having friction means and operating connections therefor comprising. in combination, toggle links acting on two parts of the friction means. a pivot connecting said links, and an operating device connected to said pivot and acting with balanced pressures through the pivot and links on said parts of the friction means and acting by reaction directly on a third and independently-movable part of the friction means.

12. A brake comprising. in combination. a

drum. friction means engageable with the drum and including at least three segments arranged end to end about the drum. operating connections between two of the segments, and applying means acting through the operating connections on said two segments and acting directly on the third segment.

13. A brake comprising. in combination. a drum. friction means engageable with the drum and including at least three segments arranged end to end about the drum, operating oonnectlons between the two end segments. and applying means acting through the operating connections on said end segments and acting directly on the intermediate segment.

14. A brake comprising. in. combination, a drum. friction means cngageable with the drum and including at least three segmentssrranged endtoendaboutthedrumapalrofthrust links acting on two of the segmentsand forming a toggle. and an applying device having a brake-apply ng motion on the third segment and acting in a togglesstraigbtenlng direction on said links.

. 15. A brake comprising. in combination. drum friction means engageable with the drum and including at least three segments arranged end to end about the drum. a pair of thrust links acting on two of the segments and connected by a pivot to form a toggle. and an applying device having a brake-applying reaction direct y against the third segment and acting in a togglestraightenlng direction on said pivot.

16. A brake comprising. in combination. a drum having a cylindrical flange. an expansible split floating band within the drum. a fixed abutment between the ends of the band. and fluid pressure operated mechanism arranged within said drum and engaging the center of said band to move it radially against the flange oi the drum, said mechanism being also capable oi limited movement clrcumi'erentialiy o! the drum along with the band to allow either end of the band to anchor against said fixed abutment.

17. A brake comprising, in combination, a drum having a cylindrical flange, an expanslbie split floating band within said drum, n fixed abutment between the ends of said band, and fluid pressure operated mechanism supported within the drum and acting radially upon the inner surface of said band to force it outward and against the interior of said flange, said mechanism being movable along with the band to thereby permit either end of the band to anchor against said fixed abutment.

ADIEL Y. DODGE. WILLARD L. POLLARD.

CERTIFICATE OF CORRECTION. Reissue No. 20, 438. August 2b., 1957.

ADIEL Y. DODGE, ET AL.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, first column, line 60, claim 6, for the word "port" read part; and that the said Letters Patent should be read with this correction therein that the sane may conform to the record of the case in the Patent Office.

Signed and sealed this 7th day of December, A. D. 1957.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents. 

